English Dictionary

A conveyance of property, upon condition, as security for the payment of a debt or the preformance of a duty, and to become void upon payment or performance according to the stipulated terms; also, the written instrument by which the conveyance is made.
Source : opted (99181)  - auto

State of being pledged; as, lands given in mortgage.
Source : opted (99182)  - auto

To grant or convey, as property, for the security of a debt, or other engagement, upon a condition that if the debt or engagement shall be discharged according to the contract, the conveyance shall be void, otherwise to become absolute, subject, however, to the right of redemption.
Source : opted (99185)  - auto

Hence: To pledge, either literally or figuratively; to make subject to a claim or obligation.
Source : opted (99186)  - auto